Piston



Peb. 213923.

- I v I in.

G. R. KEL'M V y I Patenied Feb. 2,1, 1928.

UNITED STATES 1,659,831 PATI-:NT oFFicE.

GUSTAV R. KELM, OF NEW YORK, N. Y., .ASSIGNOR TO WALKEB H. IJEVETT COMPANY, I

OF NEW YORK, N. Y., A CORPORATION OF NEW'VYORK.

PISTON.

Application filed May 18, 1921, Serial No. 470,502. Renewed September 15, 1928.

This invention relates to pistons for internal combustion engines, and particularly to pistons having a skirt which is expansiblc Which is adapted to have a snug sliding fit in the cylinder when cold. Upon expansion of the piston the skirt vwill engage the .cylinder without sticking in the cylinder, and after the cylinder has also "expanded will again automatically expand and take up the free play between the cylinder and piston,

which would otherwise occur.

Cert'ain pistons of this type have been constructed in Which the sleeve or skirt is di.- vided into longitudinal sections, by means of longitudinal slits or cuts, the opposed sections in which the piston pin bosses are positioned being integrally connected to the piston head, and the remaining sections bem separated from the head by circumferentia slots or cuts and held in proper relation to the other'` sections by means of webs extending from each pin` boss section to the other sections, interiorly of the skirt. Heretofore these webs have been straight and have been cast integral with the ends of the respective hollow. inwardly proj ecting piston pin' bosses, and each web has extended to and has joined intermediate skirt sections on lines which are chords .of the skirt circle. In such a construction each web holds rigidly apart portions of the opposed skirt sections to which itsends are respectively hjoined, 'and permits the other portions of such section to A 1 expand and contract unequally because of the angle at which the web ]oins the sections.

To overcome this objection in pistons of the kind referred to is one of the objects o f my mvention.

.Other objects and aims of the invention,

40 more or less broad than those stated above,

together with the advantages inherent, willl be in part obvious and in art specifically referred to in the course of t e following description' of the elements, combinations,, ar-

*5 rangements off parts, and. applications of.

prmciples4 constltutin the invention; and

the scope of protection contemplated will appear from the claims.

In the acoompanying drawings, which are V150 to be taken as part of this -specificatiom and in which I have shown merely a preferred form of embodiment of invention:

. ,Figure 1 is an elevation of' a piston embodymg my invention; F1gure2isabottomplanviewofthesame.

10 lie and to which they may be attached at or near their outer extremities. The

' skirt porti'ons 6' may be separated by longitudinal cuts or slits 7 from the portions 8 of the skirt intermediate the bosses 10. The skirt, preferably intermediate the bosses 10, is separated from the head 5 by circumferential slots 9. The piston pin bosses 10 are integrally connected with the head por-. tion 5 and project inwardly through transversel`y arranged webs 11 which extend to and are integral with the skirt intermediate theb piston pin bosses 10. Each web-11 is inherently a spring and preferably has a curved or bent part 12 between the boss 10 and the point at which it joins the inner face of the skirt. It has been found desirable to' have the web at its juncture to the skirt arranged at a wide angle, approximating a right angle, and therefore does not act to V affect the contraction or expansion of the skirt in'the manner-described above.

The webs are connected to the skirt' in the plane of the iston bosses and referably do not extend t e full length o the skirt to which they are united;

Inasmuch as many changes could be made in the aboveconstruction, and many appar-.

Iently widely different embodiments of my invention could be made without departing from the scope Vt hereof, it is intended that lall matter contained in the above description or shown in the accom anying drawings shall be interpreted as il ustrative and not in a limiting sense.

It ,is also to be understood that the lanused in the following claims is ingua to cover ball the generic and specific f features of the invention herein 'described a nd all statements of the scope of the, invention which, as a matter of language, might 'be said to fall therebetween.

What I claim is:

1. In a piston construction an integral y casting comprising a circumferentially grooved, ring'` receiving head and a skirt, said skirt comprising a plurality of diametrically opposed bearing slide segments the ently of the head and the bearing segments' each being circumferentially incompressible between the connections'of the Webs thereto.

2. In a piston construction an integral casting comprising a circumferentially grooved, ring receiving head and a skirt, said skirt comprising a plurality of diametrically opposed bearing slide segments 'the outer faces of which are of curvilinear form and a pair of deep diametrically opposed inwardly curved supporting webs.

which include elastic portions, said webs extending between and being connected fto the edge portions of the slide'segments at a wide angle, the said casting being circumferentially slit between the head and the slide bearing segments to permit expansive movement of the latter independently of the head and the bearing segments each being circumferentially' incompressible between the connections of the webs thereto.

3. In a piston construction an integral casting comprising a 'circumferentially grooved, ring receiving head and a skirt, said skirt comprising a plurality of diametrically opposcd bearing slide segments the outer faces of Which are of curvilinear form, eachV slide segment being cii'cumfei'-- entially incompre'ssible, 'a pair of deep diametrically opposcd inwardly curved sup- Porting webs which include .clastic portions,

said webs extending between and connecting the edge portions of the'slide segments, the I said casting being circumferentially slit between the 'head and the slide bearing segments to permit expansive movement of the latter independently of the head and Wrist pin bearing members carried by the material of the webs.

In testimony whereof I afix my signature. GUSTAV KELM. 

